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In some countries and regions, expatriates make up a large percentage of the population. Data for the following countries and regions can be cut by national and non-national resident demographic breaks: Egypt, Morocco, Lebanon, Saudi Arabia, Jordan, Syria, Iran, Palestinian Territories, Mauritania, Algeria, Bahrain, Comoros, Djibouti, Iraq, Kuwait, Oman, Qatar, Sudan, Tunisia, United Arab Emirates, Yemen and Somaliland region

You might notice that some of our income variables have been removed from the tool. In an effort to provide our best science on the calculation of income, we are setting these items "offline" for an intensive review of the methodological aspects of the calculations. The income demographic break will still be available for your analysis. Over the summer, we will be rolling out our new and improved income variables.

Data at the MSA level is reported if sample sizes for those MSAs meet the minimum requirement for reliable reporting. If sample sizes are lower than the minimum requirement, they are not reported.

A week is defined as Monday through Sunday. However, the week will not include any days in which Gallup does not conduct polling, such as holidays. For these weeks, Gallup constructs an average based on the days on which it did conduct polling. Therefore, some weeks potentially have averages based on fewer than seven days. The first week of the year is a special case because it does not necessarily start on a Monday. The first week of the year is not necessarily based on seven days of data as it will begin on whichever day that Jan. 1 lands on. For example, in 2014, the first week is Jan. 2-5. Gallup did not poll on Jan. 1 because of the holiday.

Some response scales for questions include "do not read." This indicates that the interviewer did not read the response option to the respondent and the respondent volunteered this answer.

It's possible for state-level results to lag behind national results. Gallup selects all respondents randomly, so it takes longer to collect a sufficient number of interviews in each state to be able to report results at that level.

U.S. economic data reported in Gallup Analytics are daily results rather than three-day rolling averages that are reported on Gallup's website.

MSA stands for Metropolitan Statistical Area.

There are a number of reasons why Gallup Analytics may not display data on some questions in some countries. In some countries, certain questions are deemed so culturally or politically sensitive that they may not be asked; therefore, Gallup will not have any data to display. In rare situations, Gallup researchers may also -- after rigorous review and testing -- decide to suppress data for quality reasons.

You do not need permission from Gallup for contextual citations in a book, news article, news segment, or online blog post. You would need to cite and annotate the Gallup findings like any other academic/journal notation according to the particular style being followed.

Below are examples of how to cite data from Gallup's World Poll data set in APA format.

Gallup. (Year). Gallup World Poll. [Data file]. Washington, D.C.: Gallup.

If you are using APA style, the note at the bottom of your chart or graph would look something like this:

Note. Data from Gallup World Poll (Year/Years).

The important information to cite -- beside the statistic itself -- is the publication date of the survey within the sentence. This allows the reader to clearly understand when the survey was conducted rather than an ambiguous statement like "recently Gallup found ... " This also allows your reader to more easily find the complete Gallup survey should he or she want to learn more about it.

Gallup must approve the reproduction of tables, graphics, or substantial Gallup editorial content in books. To get permission, contact permissions@gallup.com and provide details of your proposed usage.